20105553 has 32 divisors (see below), whose sum is σ = 31144960. Its totient is φ = 11430720.

The previous prime is 20105551. The next prime is 20105573. The reversal of 20105553 is 35550102.

It is not a de Polignac number, because 20105553 - 2¹ = 20105551 is a prime.

It is a super-2 number, since 2×20105553² = 808466522871618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20105551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31548 + ... + 32178.

It is an arithmetic number, because the mean of its divisors is an integer number (973280).

Almost surely, 2^20105553 is an apocalyptic number.

It is an amenable number.

20105553 is a deficient number, since it is larger than the sum of its proper divisors (11039407).

20105553 is a wasteful number, since it uses less digits than its factorization.

20105553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 20105553 is about 4483.9216094843. The cubic root of 20105553 is about 271.9184489154.

Adding to 20105553 its reverse (35550102), we get a palindrome (55655655).

The spelling of 20105553 in words is "twenty million, one hundred five thousand, five hundred fifty-three".